Code No. P2138: Accelerator Pedal Position Sensor (Main and Sub) Range/Performance Problem

OPERATION

Refer to Code No. P2122: Accelerator Pedal Position Sensor (main) Circuit Low Input .
Refer to Code No. P2127: Accelerator Pedal Position Sensor (sub) Circuit Low Input .

FUNCTION

Engine-ECU <M/T> or engine-A/T-ECU <A/T> checks the accelerator pedal position sensor output signal characteristics for abnormal conditions.

TROUBLE JUDGMENT

Check Conditions

Ignition switch is in ON position
Accelerator pedal position sensor (main) output voltage is 0.2 - 4.8 V.
Accelerator pedal position sensor (sub) output voltage is 0.2 - 4.8 V.
Change of accelerator pedal position sensor (sub) output voltage per 25 milliseconds is lower than 0.06 V.

Judgment Criterion

The difference is 0.3 V or more between the output voltages multiplied by two of the sub accelerator pedal position sensor and the output voltage of the main accelerator pedal position sensor.

PROBABLE CAUSES

Failed accelerator pedal position sensor
Loose connector contact
Failed engine-ECU <M/T> or engine-A/T-ECU <A/T>

DIAGNOSIS PROCEDURE

STEP 1. Connector check: D-202 accelerator pedal position connector

Q. Is the check result normal?

	Go to Step 2 .

	Repair or replace the connector.

STEP 2. Perform resistance measurement at D-202 accelerator pedal position sensor connector.

Disconnect connector, and measure at harness side.
Resistance between terminal No. 2 and earth.

OK: Continuity (2 Ω or less)

Q. Is the check result normal?

	Go to Step 6 .

	Go to Step 3 .

STEP 3. Connector check: D-246 engine-ECU <M/T> connector or D-217 engine-A/T-ECU <A/T> connector

Q. Is the check result normal?

	Go to Step 4 .

	Repair or replace the connector.

STEP 4. Check harness between D-202 (terminal No. 2) accelerator pedal position sensor connector and D-246 (terminal No. 91) engine-ECU <M/T> connector or D-217 (terminal No. 91) engine-A/T-ECU <A/T> connector.

Check earthing line for damage.

Q. Is the check result normal?

	Go to Step 5 .

	Repair the damaged harness wire.

STEP 5. Check the trouble symptoms

Q. Does trouble symptom persist?

	Replace the engine-ECU <M/T> or engine-A/T-ECU <A/T>.

	Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).

STEP 6. Perform resistance measurement at D-202 accelerator pedal position sensor connector.

Disconnect connector, and measure at harness side.
Resistance between terminal No. 5 and earth.

OK: Continuity (2 Ω or less)

Q. Is the check result normal?

	Go to Step 9 .

	Go to Step 7 .

STEP 7. Connector check: D-246 engine-ECU <M/T> connector or D-217 engine-A/T-ECU <A/T> connector

Q. Is the check result normal?

	Go to Step 8 .

	Repair or replace the connector.

STEP 8. Check harness between D-202 (terminal No. 5) accelerator pedal position sensor connector and D-246 (terminal No. 120) engine-ECU <M/T> connector or D-217 (terminal No. 120) engine-A/T-ECU <A/T> connector.

Check earthing line for damage.

Q. Is the check result normal?

	Go to Step 5 .

	Repair the damaged harness wire.

STEP 9. Connector check: D-246 engine-ECU <M/T> connector or D-217 engine-A/T-ECU <A/T> connector

Q. Is the check result normal?

	Go to Step 10 .

	Repair or replace the connector.

STEP 10. Check harness between D-202 (terminal No. 1) accelerator pedal position sensor connector and D-246 (terminal No. 92) engine-ECU <M/T> connector or D-217 (terminal No. 92) engine-A/T-ECU <A/T> connector.

Check power supply line for damage.

Q. Is the check result normal?

	Go to Step 11 .

	Repair the damaged harness wire.

STEP 11. Check harness between D-202 (terminal No. 4) accelerator pedal position sensor connector and D-246 (terminal No. 102) engine-ECU <M/T> connector or D-217 (terminal No. 102) engine-A/T-ECU <A/T> connector.

Check power supply line for damage.

Q. Is the check result normal?

	Go to Step 12 .

	Repair the damaged harness wire.

STEP 12. Check harness between D-202 (terminal No. 3) accelerator pedal position sensor connector and D-246 (terminal No. 114) engine-ECU <M/T> connector or D-217 (terminal No. 114) engine-A/T-ECU <A/T> connector.

Check output line for damage.

Q. Is the check result normal?

	Go to Step 13 .

	Repair the damaged harness wire.

STEP 13. Check harness between D-202 (terminal No. 6) accelerator pedal position sensor connector and D-246 (terminal No. 107) engine-ECU <M/T> connector or D-217 (terminal No. 107) engine-A/T-ECU <A/T> connector

Check output line for damage.

Q. Is the check result normal?

	Go to Step 14 .

	Repair the damaged harness wire.

STEP 14. Replace the accelerator pedal assembly

After replacing the accelerator pedal assembly, re-check the trouble symptoms.

Q. Is the check result normal?

	Check end.

	Replace the engine-ECU <M/T> or engine-A/T-ECU <A/T>.